Olavius amplectens Erséus & Bergfeldt, 2007, sp. nov.
Olavius amplectens sp. nov. Figure 2 Material examined Holotype: SMNH Type Coll. 6373, wholemounted specimen Type locality: New Caledonia, Loyalty Islands, Lifou, Baie du Santal, 18 m (station NC00 5). Paratypes: SMNH Type Coll. 6374 –6380, 7 specimens: 2 from type locality, 1 from NC00 29, and 2...
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2007
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Online Access: | https://dx.doi.org/10.5281/zenodo.5667329 https://zenodo.org/record/5667329 |
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openpolar |
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Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
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unknown |
topic |
Biodiversity Taxonomy Animalia Annelida Clitellata Haplotaxida Tubificidae Olavius Olavius amplectens |
spellingShingle |
Biodiversity Taxonomy Animalia Annelida Clitellata Haplotaxida Tubificidae Olavius Olavius amplectens Erséus, Christer Bergfeldt, Ulrika Olavius amplectens Erséus & Bergfeldt, 2007, sp. nov. |
topic_facet |
Biodiversity Taxonomy Animalia Annelida Clitellata Haplotaxida Tubificidae Olavius Olavius amplectens |
description |
Olavius amplectens sp. nov. Figure 2 Material examined Holotype: SMNH Type Coll. 6373, wholemounted specimen Type locality: New Caledonia, Loyalty Islands, Lifou, Baie du Santal, 18 m (station NC00 5). Paratypes: SMNH Type Coll. 6374 –6380, 7 specimens: 2 from type locality, 1 from NC00 29, and 2 from each of NC00 35 and NC00 38. Other material: SMNH Main Coll. 85069 –85080, 12 specimens: 1 from each of type locality, NC00 8, NC00 35 and NC0037, 2 from NC00 29, and 6 from NC00 38. Description Length 1.3–2.4 mm, with 15–22 segments. Width at XI, 0.10–0.18 mm. Body cylindrical. Prostomium rounded. Pygidium variable, with rounded tip. Clitellum extending over X–XII. Body wall not conspicuously annulated but often 15 small secondary annuli visible per (postclitellar) segment. Somatic chaetae (Fig. 2 A) long, protruding conspicuously from bodywall, bifid, with upper teeth thinner and shorter than lower, and each with conspicuous subdental ligament. These chaetae 31–39 m long, about 2 m thick, 2 per bundle throughout body. Penial chaetae (Fig. 2 B, pc) slender, 3 per bundle, more or less parallel, 50–70 m long, about 2 m thick, with singlepointed hooked tips. These chaetae characteristically protruding (at least in all fixed specimens) from body ventrally in XI. Spermathecal pores paired, located in line with dorsal somatic chaetae, in middle of segment X. Male pores paired, located in line with ventral chaetae, in posterior part of XI. Male and female genitalia (Fig. 2 B) paired. Vas deferens thin but muscular, 7–10 m wide for most parts, longer than atrium, coiled, gradually widening into atrium, cilia not observed but probably present inside. Atrium oval, 35–60 m long, about 20–30 m wide, with thin indistinct muscular layer, and granulated compartmented inner epithelium, but cilia not observed on latter, lumen narrow. Two, somewhat lobed, prostate glands present, one located anterior to and attached to ental part of atrium, other located posterior and attached to ectal end of atrium by stalk. Atrium opening into inner end of a complex copulatory sac with heavily folded wall; this sac communicating with exterior through small (male) pore (pore not shown in Fig. 2 B, as it is hidden under copulatory sac). Spermathecae (Fig. 2 B, s) somewhat curved, thinwalled, totally 85–135 m long, 35–50 m wide, duct short but well set off from ampullae. Each spermatheca with somewhat bundled sperm. Etymology Named Olavius amplectens (Latin for clasping) for its long penial chaetae, which protrude conspicuously from body wall in segment XI. Remarks In this species, the spermathecal pores are located more or less in line with the dorsal somatic chaetae in the middle of segment X, and the penial chaetae are slender, multiple (more than two per bundle), sigmoid, and conspicuously hooked, a combination of features that make it most similar to O. cornuatus Davis, 1984. The latter is a Northwest Atlantic species (known only from off Massachusetts, USA; Davis 1984), and the two taxa are not necessarily closely related. Differences between them are that O. amplectens has (i) only two somatic chaetae per bundle ( O. cornuatus has up to four chaetae per bundle in anterior segments), and (ii) less developed copulatory organs (in O. cornuatus , the outer ends of the atria appear like large protrusible penes). The most striking feature of this new species, however, is that the somatic as well as penial chaetae protrude from the body wall, at least more so than noted for any other gutless species known to date. Distribution and habitat New Caledonia (Loyalty Islands). Subtidal, more or less heterogeneous sand, 4–40 m depth. : Published as part of Erséus, Christer & Bergfeldt, Ulrika, 2007, Six new species of the gutless genus Olavius (Annelida: Clitellata: Tubificidae) from New Caledonia, pp. 45-58 in Zootaxa 1400 on pages 49-50, DOI: 10.5281/zenodo.175403 : {"references": ["Davis, D. (1984) Olavius cornuatus sp. n. (Oligochaeta, Tubificidae) from Georges Bank (NW Atlantic). Zoologica Scripta, 13, 273 - 275."]} |
format |
Text |
author |
Erséus, Christer Bergfeldt, Ulrika |
author_facet |
Erséus, Christer Bergfeldt, Ulrika |
author_sort |
Erséus, Christer |
title |
Olavius amplectens Erséus & Bergfeldt, 2007, sp. nov. |
title_short |
Olavius amplectens Erséus & Bergfeldt, 2007, sp. nov. |
title_full |
Olavius amplectens Erséus & Bergfeldt, 2007, sp. nov. |
title_fullStr |
Olavius amplectens Erséus & Bergfeldt, 2007, sp. nov. |
title_full_unstemmed |
Olavius amplectens Erséus & Bergfeldt, 2007, sp. nov. |
title_sort |
olavius amplectens erséus & bergfeldt, 2007, sp. nov. |
publisher |
Zenodo |
publishDate |
2007 |
url |
https://dx.doi.org/10.5281/zenodo.5667329 https://zenodo.org/record/5667329 |
genre |
Northwest Atlantic |
genre_facet |
Northwest Atlantic |
op_relation |
http://publication.plazi.org/id/785ED822FFB1C33778716A02FFA1FFF3 http://zoobank.org/7D9737F8-41F8-4801-B797-D9E791E6084C https://zenodo.org/communities/biosyslit https://dx.doi.org/10.5281/zenodo.175403 http://publication.plazi.org/id/785ED822FFB1C33778716A02FFA1FFF3 https://dx.doi.org/10.5281/zenodo.175405 http://zoobank.org/7D9737F8-41F8-4801-B797-D9E791E6084C https://dx.doi.org/10.5281/zenodo.5667330 https://zenodo.org/communities/biosyslit |
op_rights |
Open Access info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5281/zenodo.5667329 https://doi.org/10.5281/zenodo.175403 https://doi.org/10.5281/zenodo.175405 https://doi.org/10.5281/zenodo.5667330 |
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1766149093415976960 |
spelling |
ftdatacite:10.5281/zenodo.5667329 2023-05-15T17:45:49+02:00 Olavius amplectens Erséus & Bergfeldt, 2007, sp. nov. Erséus, Christer Bergfeldt, Ulrika 2007 https://dx.doi.org/10.5281/zenodo.5667329 https://zenodo.org/record/5667329 unknown Zenodo http://publication.plazi.org/id/785ED822FFB1C33778716A02FFA1FFF3 http://zoobank.org/7D9737F8-41F8-4801-B797-D9E791E6084C https://zenodo.org/communities/biosyslit https://dx.doi.org/10.5281/zenodo.175403 http://publication.plazi.org/id/785ED822FFB1C33778716A02FFA1FFF3 https://dx.doi.org/10.5281/zenodo.175405 http://zoobank.org/7D9737F8-41F8-4801-B797-D9E791E6084C https://dx.doi.org/10.5281/zenodo.5667330 https://zenodo.org/communities/biosyslit Open Access info:eu-repo/semantics/openAccess Biodiversity Taxonomy Animalia Annelida Clitellata Haplotaxida Tubificidae Olavius Olavius amplectens Taxonomic treatment article-journal Text ScholarlyArticle 2007 ftdatacite https://doi.org/10.5281/zenodo.5667329 https://doi.org/10.5281/zenodo.175403 https://doi.org/10.5281/zenodo.175405 https://doi.org/10.5281/zenodo.5667330 2022-02-08T13:29:49Z Olavius amplectens sp. nov. Figure 2 Material examined Holotype: SMNH Type Coll. 6373, wholemounted specimen Type locality: New Caledonia, Loyalty Islands, Lifou, Baie du Santal, 18 m (station NC00 5). Paratypes: SMNH Type Coll. 6374 –6380, 7 specimens: 2 from type locality, 1 from NC00 29, and 2 from each of NC00 35 and NC00 38. Other material: SMNH Main Coll. 85069 –85080, 12 specimens: 1 from each of type locality, NC00 8, NC00 35 and NC0037, 2 from NC00 29, and 6 from NC00 38. Description Length 1.3–2.4 mm, with 15–22 segments. Width at XI, 0.10–0.18 mm. Body cylindrical. Prostomium rounded. Pygidium variable, with rounded tip. Clitellum extending over X–XII. Body wall not conspicuously annulated but often 15 small secondary annuli visible per (postclitellar) segment. Somatic chaetae (Fig. 2 A) long, protruding conspicuously from bodywall, bifid, with upper teeth thinner and shorter than lower, and each with conspicuous subdental ligament. These chaetae 31–39 m long, about 2 m thick, 2 per bundle throughout body. Penial chaetae (Fig. 2 B, pc) slender, 3 per bundle, more or less parallel, 50–70 m long, about 2 m thick, with singlepointed hooked tips. These chaetae characteristically protruding (at least in all fixed specimens) from body ventrally in XI. Spermathecal pores paired, located in line with dorsal somatic chaetae, in middle of segment X. Male pores paired, located in line with ventral chaetae, in posterior part of XI. Male and female genitalia (Fig. 2 B) paired. Vas deferens thin but muscular, 7–10 m wide for most parts, longer than atrium, coiled, gradually widening into atrium, cilia not observed but probably present inside. Atrium oval, 35–60 m long, about 20–30 m wide, with thin indistinct muscular layer, and granulated compartmented inner epithelium, but cilia not observed on latter, lumen narrow. Two, somewhat lobed, prostate glands present, one located anterior to and attached to ental part of atrium, other located posterior and attached to ectal end of atrium by stalk. Atrium opening into inner end of a complex copulatory sac with heavily folded wall; this sac communicating with exterior through small (male) pore (pore not shown in Fig. 2 B, as it is hidden under copulatory sac). Spermathecae (Fig. 2 B, s) somewhat curved, thinwalled, totally 85–135 m long, 35–50 m wide, duct short but well set off from ampullae. Each spermatheca with somewhat bundled sperm. Etymology Named Olavius amplectens (Latin for clasping) for its long penial chaetae, which protrude conspicuously from body wall in segment XI. Remarks In this species, the spermathecal pores are located more or less in line with the dorsal somatic chaetae in the middle of segment X, and the penial chaetae are slender, multiple (more than two per bundle), sigmoid, and conspicuously hooked, a combination of features that make it most similar to O. cornuatus Davis, 1984. The latter is a Northwest Atlantic species (known only from off Massachusetts, USA; Davis 1984), and the two taxa are not necessarily closely related. Differences between them are that O. amplectens has (i) only two somatic chaetae per bundle ( O. cornuatus has up to four chaetae per bundle in anterior segments), and (ii) less developed copulatory organs (in O. cornuatus , the outer ends of the atria appear like large protrusible penes). The most striking feature of this new species, however, is that the somatic as well as penial chaetae protrude from the body wall, at least more so than noted for any other gutless species known to date. Distribution and habitat New Caledonia (Loyalty Islands). Subtidal, more or less heterogeneous sand, 4–40 m depth. : Published as part of Erséus, Christer & Bergfeldt, Ulrika, 2007, Six new species of the gutless genus Olavius (Annelida: Clitellata: Tubificidae) from New Caledonia, pp. 45-58 in Zootaxa 1400 on pages 49-50, DOI: 10.5281/zenodo.175403 : {"references": ["Davis, D. (1984) Olavius cornuatus sp. n. (Oligochaeta, Tubificidae) from Georges Bank (NW Atlantic). Zoologica Scripta, 13, 273 - 275."]} Text Northwest Atlantic DataCite Metadata Store (German National Library of Science and Technology) |